National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

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What anatomical structures make up the inverted Y in maxillary PA?

Floor of nasal fossa and maxillary sinus border

The inverted Y seen on a maxillary PA is formed by the borders of the floor of the nasal fossa and the medial wall of the maxillary sinus. This specific angle allows for better visualization of the maxillary sinus and its relationship to the adjacent structures. The other options, while they do involve the maxillary sinus and neighboring structures, do not accurately describe the specific formation of the inverted Y on a maxillary PA. Therefore, they are incorrect.

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Maxillary sinus and zygomatic arch

Floor of nasal fossa and palatine process

Maxillary sinus border and palatine process

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